Your fuge will only provide extra water volume, and any macros you have will suck up more nutrients, but you wont get anywhere near the amount of pods into your main tank with the fuge returning to the sump. If you gravity feed the fuge into the main tank, you'll have water from the fuge(therefore pods as well) flowing into your main tank.
Sorry, I wasnt clear on that. If your bulkhead was at the top, holding the water line, you would want to run PVC tubing from the 'in-tank' side of the bulkhead down to the bottom of the fuge. If you were to put the bulkhead on the bottom, or down on the side of the fuge, you'd have to bring the tubing back up to where you want the desired water level in the tank. Im getting at the fact that IMO water should be flowing out near the bottom/sides of the fuge, rather than going out or over an overflow at the top of the tank, as less pods occur free-floating in the water.
I will try to do up a diagram and post it.
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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